GUYOMAR [III], son of HERVE [I] Vicomte de Léon & his first wife --- ([before 1120]-after 1179). "Herveus Leonensis Vicecomes" donated "juxta castrum meum…Mons-Relaxus" to Saint-Martin for a monastery by charter dated 3 Mar 1128, signed by "Hervei vicecomitis, Guihomar filii eius, Eudonis"[630]. It is assumed that his inclusion in the witness list indicates that Guyomar [III] was not younger than about 8 years old at the time of this document. "H…Leonensis comes" confirmed the donation to the abbey of St Melaine made by "pater meus G. vicecomes" by undated charter, signed by “Ego H et ipsi duo filii mei”[631]. The Guillelmi Armorici Historia records that "Herveus Comes Leoniæ…cum Guidomaro filio suo" were captured in 1163 and imprisoned "apud castellum Nini"[632]. Vicomte de Léon. Robert of Torigny records the death in 1168 of "Herveus de Lehun" and the succession of "Guihomar filius eius"[633]. "Guidomarus…Leonensis dominus et uxor suo Nobilis filiique sui Guidomarus et Herveus" founded the abbey of Daoulas by undated charter[634]. Robert of Torigny records that the castle of "Guihomarum vicecomitemLeonensem" was captured by "Gaufridus regis Henrici" in 1179[635].
m NOBILIS, daughter of ---. "Guidomarus…Leonensis dominus et uxor suo Nobilis filiique sui Guidomarus et Herveus" founded the abbey of Daoulas by undated charter[636].
Guyomar [III] & his wife had three children